cold

Dear teachers.

what's the difference between 1,2 and 3?

1, What's wrong with your voice, do you have a cold?
2, What's wrong with your voice, did you have a cold?
3, What's wrong with your voice, did you get a cold?

Have a nice day!

[Mister Micawber]

1-- do you have a cold now?
2-- did you have a cold before now?
3-- did you catch a cold before now and have it now?

[RonBee]

Commentary

1. What's wrong with your voice, do you have a cold?

That's natural English, but when writing it use two sentences (or at least use a semicolon).

2, What's wrong with your voice, did you have a cold?

The did in the second clause puts that clause in the past tense. It clashes with the first clause. Better: "What's wrong with your voice. Are you getting over a cold?" (Using did puts the clause in the simple past, meaning that the cold could have happened at any time.)

3, What's wrong with your voice, did you get a cold?

Mr. Micawber's interpretation is possible, but the first sentence is a more natural way of saying that. (If a person has a cold now he naturally acquired it before now.)